Surface Tension of Water by Capillary Rise and Effect of Detergents NEET Questions

Physics - Experimental Skills

Surface Tension of Water by Capillary Rise and Effect of Detergents MCQ Questions


13.
For mercury in a glass tube, the angle of contact is approximately:
A.
45°
B.
0°
C.
140° (mercury does not wet glass)
D.
90°
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ANSWER :
C. 140° (mercury does not wet glass)
14.
If the angle of contact θ < 90°, the meniscus is:
A.
Flat
B.
Spherical bead
C.
Convex (dome-shaped)
D.
Concave (cup-shaped, dipping in the middle)
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ANSWER :
D. Concave (cup-shaped, dipping in the middle)
15.
If the angle of contact θ > 90°, the meniscus is:
A.
Convex (dome-shaped)
B.
Concave
C.
Inverted
D.
Flat
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ANSWER :
A. Convex (dome-shaped)
16.
If the angle of contact is exactly 90°, the:
A.
Liquid evaporates
B.
Meniscus is flat and there is no capillary rise or depression
C.
Liquid is depressed
D.
Liquid rises to maximum
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ANSWER :
B. Meniscus is flat and there is no capillary rise or depression
17.
Pure water rises in a clean glass capillary because:
A.
Cohesion is greater than adhesion
B.
Gravity is weak
C.
Glass is hot
D.
Adhesion (water-glass) is greater than cohesion (water-water); θ < 90°
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ANSWER :
D. Adhesion (water-glass) is greater than cohesion (water-water); θ < 90°
18.
Mercury depresses in a glass capillary because:
A.
Glass is hot
B.
Mercury is metallic
C.
Cohesion (Hg-Hg) is greater than adhesion (Hg-glass); θ > 90°
D.
Mercury is denser than glass
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ANSWER :
C. Cohesion (Hg-Hg) is greater than adhesion (Hg-glass); θ > 90°